Google Lighthouse is described as 'Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more' and is an app in the Development category. There are more than 10 alternatives to Google Lighthouse for a variety of platforms, including Online / Web-based, SaaS, Google Chrome, Firebug and Firefox. The best alternative is Screpy. It's not free, so if you're looking for a free alternative, you could try GTmetrix or PageSpeed Insights. Other great apps like Google Lighthouse are WebPagetest (Free, Open Source), Yellow Lab Tools (Free, Open Source), DareBoost (Freemium) and Pingdom Website Speed Test (Free).
Monitor your Google PageSpeed Insights Score and receive alerts when the score falls. Track your score over time with URL history so you can see when things changed. Scan your entire site instead of just the homepage. PageSpeedPlus.
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